Homework #3 - Accelerated motion_ Free fall-solutions

Homework #3 - Accelerated motion_ Free fall-solutions -...

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1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – ±nd all choices before answering. 001 (part 1 of 6) 10.0 points Consider the plot below describing motion of an object along a straight path as shown in the ±gure below. - 2 0 2 4 6 0 2 4 6 8 10 12 14 16 18 20 b b b b b b time (s) velocity (m/s) Find the average acceleration during the time interval 0 s to 5 s. Correct answer: 0 m / s 2 . Explanation: Given : v i = 5 m / s , v f = 5 m / s , t i = 0 s and t f = 5 s . a avg = Δ v Δ t = v f - v i Δ t = (5 m / s) - (5 m / s) (5 s) - (0 s) = 0 m / s 2 . 002 (part 2 of 6) 10.0 points Find the average acceleration during the time interval 5 s to 15 s. Correct answer: - 0 . 4 m / s 2 . Explanation: Given : v i = 5 m / s , v f = 1 m / s , t i = 5 s and t f = 15 s . a avg = (1 m / s) - (5 m / s) (15 s) - (5 s) = - 0 . 4 m / s 2 . 003 (part 3 of 6) 10.0 points Find the average acceleration during the time interval 0 s to 20 s. Correct answer: - 0 . 2 m / s 2 . Explanation: Given : v i = 5 m / s , v f = 1 m / s , t i = 0 s and t f = 20 s . a avg = (1 m / s) - (5 m / s) (20 s) - (0 s) = - 0 . 2 m / s 2 . 004 (part 4 of 6) 10.0 points Find the instantaneous acceleration at 2 s. Correct answer: 0 m / s 2 . Explanation: At t = 2 s, the slope of the tangent line is zero; therefore the acceleration is zero . 005 (part 5 of 6) 10.0 points Find the instantaneous acceleration at 10 s. Correct answer: - 0 . 4 m / s 2 2 .
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Homework #3 - Accelerated motion_ Free fall-solutions -...

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